Insulator



(No Model.)

W. H. SEAMON.

INSULATOR.

No. 430,696. Patented June 24, 1890.

l/V VE N TOR WITNESSES:

HMATTOHNEYS UNITED STATES PATENT OFFICE.

\VILLIAM I I. SEAMON, OF ROLLA,MISSOURI.

INSULATOR.

SPECIFICATION forming part of Letters Patent No. 430,696, dated June 24, 1890.

Application filed February 17, 1890. Serial No. 340,822. (No model.)

To all whom it may concern.-

Be it known that 1, WILLIAM H. SEAMON, of Rolla, in the county of Phelps, State of Missouri, have invented certain new and useful Improvements in Electric-Wire Insulators and Supports, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

My invention relates to that class of insulating supports commonly made of glass and adapted to be secured in place upon crossarms; and it consists in the improved con struction, combination, and arrangement of parts hereinafter set forth, and pointed out in the claims.

In the drawings, Figure l is an enlarged perspective view of the insulator. Fig.2 is a view of an ordinary pole having cross-arms with my improved insulators applied thereto. Fig. 3 is an enlarged end view of an insulator, and Fig. 4 is a longitudinal section through the same on line 00 w of Fig. 3. I

Heretofore insulators for cross-arms and the like were usually made hollow and screwed upon a threaded pin carried by the arm, so as to assume a vertical position, or else they were provided with an external thread and screwed into threaded apertures in the crossarm, so as to still retain the vertical position with relation to the arm and the pole, and the electrical conductors were tied to the exterior of such insulators, as in the case of United States Patent No. 107,075. The difficulty incurred by all such constructions was the fact that the tie-wires would sometimes break, permitting the heavily-charged conductors to fall to the ground, endangering in many cases the lives of human beings, all as is well known. To overcome such diificulty is one of the objects of my invention, and I do it by providing suitable passages through the insulator, in which the tiewire and also the conductor are firmly located and secured. 1 represents a series of the usual cross-arms, but which instead of having the ordinary vertical pins projecting from their upper surfaces, have a series of horizontal holes a, which are threaded for reception of the insulators,

or which may be devoid of threads, leaving the threads upon the insulator to cut a thread in them, as may be preferred.

2 is the insulator, which should be made of glass, porcelain, or similar material possessing insulative properties, and which is in the form of a comparatively-perfect cylinder of like diameter at each end, so as to adapt its ends for use interchangeably, as will presently be explained. Thus it is that thedevice is of cylindrical form, provided with a screw-thread 3 upon' its exterior extending continuously from terminal to terminal, and having a larger passage 4., extending likewise from, end to end through said insulator, in which the conductor is to be located and held, and also a smaller passage 5 similarly formed, but located in a vertical plane that is relatively above or over said larger passage, this last passage being adapted for engagement by the tie-wire.

The operation or function is as follows: When an insulator is to be mounted in a cross-arm, a suitable horizontal and transverse passage is made through said crossarm, and the insulator is screwed therein by any suitable wrench or implement, so that it will lie in a horizontal plane with its passages extending in the direction in which the wires run, as shown in Fig. 2. Then after the insulator has been placed with its smaller passage upward, preferably, the electrical conductor is to be run through the larger passage 4. and securely tied by means of an ordinary tie -wire, which is run through the smaller passage 5 and has its ends twisted around'the said conductor.

I do not broadly claim an insulator with screw-threads upon its outer surface, as that alone is clearly shown in the patent hereinbefore mentioned.

Having thus described my invention, what I claim is- 1. A cylindrical insulator for electrical conductors, adapted to be bodily located in a cross-arm or support and having a longitudinal passage or bore extending from terminal to terminal for reception of the conductor and having an additional parallel passage similarly formed and located, and a arm in which it is bodily located or embedded tie-wire located in said additional passage, with its passage-Way extending in aline with substantially as set forth. the conducting-wire, substantiallyas setforth. 2. The insulator having an exterior screw- In testimony whereof I aflix my signature in 5 thread and parallel passages for conductor presence of two witnesses.

and tie wire, formed integrally, substantially as hereinbefore set forth. 7 WILLIAM H. SEAMON.

3. A cylindrical insulator having an eXter- Witnesses: nal screw-thread and internal passage-way, in E. G. MITCHELL,

1o combination with a support, such as a cross- S. N. HASELTINE. 

